I strongly recommend that you try this on the textured surface... start with a clean dash. That is the easy part. You then put a latex glove on and spray it with a product such as 303 (this is all I've tried and I see no reason not to use it). Massage it into the dash. This gets it into all of those grooves. Let it sit for at least 20 minutes but not longer than a couple of hours (letting it sit for a long time makes it too tacky). Lightly buff off the excess with a microfiber towel. This will give it a dark even color. It will also give maximum protection from UV rays. Of course this works on the door trim as well. Personally, I'll never go back to doing it any other way. Reapplying every so often is easier. Spraying product on a rag and wiping down the surface does not work well as it does not get into the textured areas. Same with spraying it onto the surface directly, it is uneven. Also, allowing it to sit allows some (very little) of the product to remain on the plastic. After all, why wipe 99.99% of it away.